CN104977322B - A kind of single channel seven-electrode conductivity detects monitor - Google Patents
A kind of single channel seven-electrode conductivity detects monitor Download PDFInfo
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- CN104977322B CN104977322B CN201510451495.4A CN201510451495A CN104977322B CN 104977322 B CN104977322 B CN 104977322B CN 201510451495 A CN201510451495 A CN 201510451495A CN 104977322 B CN104977322 B CN 104977322B
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Abstract
Monitor is detected the invention discloses a kind of single channel seven-electrode conductivity, together with seven electrodes or four electrode conductivity sensors, the Detection ＆ Controling to industry spot electrical conductivity are realized；Using the accurate exchange constant current drive of point gear, measurement range is 20uS/cm~200mS/cm, and test point relative accuracy 1%, the conductance electrode of supporting Different electrodes constant, measurement range can be widened further.The present invention uses industrial standard liquid crystal touch screen, and the configuration software being furnished with using the screen coordinates progress data communication to exchange with scm software, realize input, the output of data, system is shown equipped with operation calibration picture, real-time curve record, history curve inquiry, current alerts, history alarm indication, in addition, also manual/auto control switches, manual ON/OFF pump switches, CAN communication is indicated, system alarm is shown.Manufacturing cost of the present invention is low, technique is simple, measurement accuracy is high, strong antijamming capability, function are more, maintenance maintenance is convenient.
Description
Technical field
The invention belongs to chemical process parameter on-line checking field, it is related to the online indirect of industry spot conducting solution concentration
Detection ＆ Controling, it is especially closely related with Adding medicine control with the detection of aluminium shape surface process Zhong Ge workshop sections electrical conductivity, specifically
It is related to a kind of single channel seven-electrode conductivity detection monitor.
Background technology
During chemical reaction, electrical conductivity is an important parameter of solution, and its size directly reflects leading for solution
Electric energy power, and it is closely related with the concentration of electrolyte；These carry out the field of other parameters detection using electrical conductivity as intermediate variable
Close, be required for a kind of stable, accurate conductivity detector；At present, in aluminium shape surface processing procedure, due to live ring
Border is severe, and extremely strong, the possible incrustation of solution corrosion is, it is necessary to make periodic maintenance, and the instrument of only Ji Jia manufacturers of foreign countries is installed on state
Interior production scene, and the electric conductivity detector of domestic manufacturer's production does not almost have；Therefore, it is necessary to design a set of and seven electrode sensings
The supporting detection monitor of device, can anti-corrosion and energy anti-tartar；And from the equipment of external import is mostly expensive, maintenance maintenance is stranded
It is difficult.
The content of the invention
It is an object of the invention to overcome the shortcoming and deficiency of prior art to be detected there is provided a kind of single channel seven-electrode conductivity
Monitor, power unit is strengthened using wave filter with solid capacitor, and analog portion all uses thousand-island forest park standard electric
Resistance exchanges operational amplifier with precision, and all signal grounds are all grounded again by safety capacitance connection shell, therefore has stronger resist
Interference performance, due to using the accurate exchange constant current drive of point gear, there is certain anti-electrode incrustation ability；Amplified using high resistant instrument
Device is acquired to signal, can either resist common mode disturbances, is also resistant to certain electrode incrustation；Circuit structure has also further made letter
Change, selection standard industry control liquid crystal touch screen is shown and operated to data, be easy to carry out data exchange with standard device, because
This, the present invention has measurement accuracy height, reliability height, many functions, low cost, intelligence degree are high, it is easy to maintenance to manufacture, can
The advantages of with miscellaneous equipment networking, the present invention can not only connect seven-electrode conductivity sensor, can also connect the conductance of four electrodes
Rate sensor；Range can carry out direct measurement to the electrical conductivity of 20uS/cm~200mS/cm scopes, coordinate various provided with four gears
The electrode of conductance constant can make further extension to range ability；The driving frequency of conductivity meter is adjustable, fixes tentatively as high week
1100Hz。
The purpose of the present invention is achieved through the following technical solutions：
A kind of single channel seven-electrode conductivity detects monitor, and its liquid crystal touch screen data display is with input manipulation such as Fig. 1 institutes
Show, be configured with liquid crystal touch screen CAN addresses display window 1, temperature display device 2, standard conductivity display window 3, current alerts by
Button 4, real-time curve button 5, operation calibration frames button 6, history curve button 7, history alarm button 8, help button 9, pump
Switch indicate display window 10, auto-manual switching push button 11, system alarm state display window to change 12, CAN communication state display window to change 13,
The manual mutual association of on/off switch button 14 composition；Liquid crystal touch screen is powered by external DC24V, and interface passes through stub cable and master
Corresponding points on machine plate are connected.
As shown in Fig. 2 the circuit of the motherboard by first in piece circuit system 15, mainboard digital power 16, safety
The circuit 17 of electric capacity one, mainboard analog power 18, in piece system power supply and reset circuit 19, analog signal limiter protection circuit
20th, CAN isolated drive circuit 21, switch output control circuit 22, built-in function circuit 23, liquid crystal touch screen input/defeated
Go out communication interface circuit 24, display board communication interface circuit 25, temperature detection interface 26, temperature pick-up isolation circuit 27, conductance
Trip stop transmission circuit 28, conductance measurement turn direct current and isolation circuit 29, Conductivity detection interface 30, constant current signal driving electricity with exchanging
Road 31, exiting signal generating circuit 32, precision voltage source circuit 33, conductance isolation analog power 34, the circuit 35 of safety electric capacity two
Common electrical connection composition；
As shown in figure 3, in motherboard circuits of the present invention, first in piece circuit system 15 by integrated circuit U1, crystal oscillator
U2, connector J1, resistance R1, electric capacity C1~C22 common electricals are connected and composed；As shown in figure 4, in piece system power supply and reset
Circuit 19 by voltage-stablizer U3 and U4, connector J2, diode D1~D4 and D6~D7, light emitting diode D5 and D8, resistance R2~
R5, electric capacity C23~C29, button S1 common electricals are connected and composed；As shown in figure 5, analog signal limiter protection circuit 20 is by amplifying
Device U6 and U8, voltage stabilizing chip U5, limited amplitude protection chip U7, resistance RX1~RX9 and R6, electric capacity C30~C35 and CX1, luminous two
Pole pipe L1 common electricals are connected and composed；As shown in fig. 6, mainboard with digital power 16 by connector DC1 and outside connected switch power supply, filter
Ripple device U9, electric capacity C36 and C37 common electrical connection composition；The circuit 17 of safety electric capacity one is by magnetic bead RL1, resistance R7, safety electric capacity
C38 common electricals connection composition；Mainboard with analog power 18 by connector DC2 and outside connected switch power supply, wave filter U10 and U11,
Electric capacity C39~C42 common electricals connection composition；As shown in fig. 7, switch output control circuit 22 is by relay U13, connector
J5, triode N1, diode D9, resistance R15, electric capacity C44 common electricals connection composition, wherein J5 provide switch control output,
Dial-up NBJ1 can forbid it to export；Built-in function circuit 23 is by toggle switch NBJ1 and NBJ2, exclusion R14 common electrical connection groups
Into NBJ1 is monitoring dial-up, and NBJ2 is CAN geocodings；Liquid crystal touch screen input/output communication interface circuit 24 is by integrated electricity
Road U12, connector P1 and J4, resistance R10~R13, magnetic bead RL2, electric capacity C43 common electricals connection composition, wherein, P1 connection liquid
Brilliant touch-screen；Display board communication interface circuit 25 is made up of connector J3, resistance R8~R9 common electricals connection, standby；Such as Fig. 8
Shown, CAN isolated drive circuit 21 is jointly electric by integrated circuit U14, connector CAN1, resistance R16~R17, electric capacity C45
Gas connection composition, wherein, the external CANs of CAN1；As shown in figure 9, temperature detection interface 26 is made up of connector JT1, it is external
Semiconductor temperature sensor；Temperature pick-up isolation circuit 27 is by amplifier U16, signal isolator U15, resistance R18~R20, electricity
Hold C46~C55 common electricals to connect and compose；As shown in Figure 10, conductance measurement turns direct current and isolation circuit 29 by amplifying with exchanging
Device U17 and U20~U21 and U24, AC DC signal adapter U19 and U22, signal isolator U18 and U23, resistance R21~
R25, electric capacity C56~C75 common electricals are connected and composed；Conductivity detection interface 30 is made up of connector JD1, external seven electrode conductance
Rate sensor；As shown in figure 11, conductance trip stop transmission circuit 28 is by relay U25~U29, triode N2~N6, diode D10
~D14, resistance R26~R31 common electricals are connected and composed；Constant current signal drive circuit 31 is by amplifier U31~U33, resistance
RX10~RX14 and RA1~RA13, electric capacity C76~C79 and C83~C89 common electricals are connected and composed；Exiting signal generating circuit
32 are connected and composed by integrated circuit U30, resistance RIN1 and R32, electric capacity C80~C81 and C82 and CF1 common electricals；Such as Figure 12 institutes
Show, precision voltage source circuit 33 is by voltage-stablizer U36~U37, inductance L2~L5, electric capacity C94~C97 and C99~C100 common electricals
Connect and compose；Conductance is with isolation analog power 34 by connector DC3 and outside connected switch power supply, wave filter U34~U35, electric capacity C90
~C93 common electricals are connected and composed；The circuit 35 of safety electric capacity two is connected by resistance R33, magnetic bead RL3, safety electric capacity C98 common electricals
Connect composition；
Motherboard of the present invention, external 3 Switching Power Supplies are by power line and mainboard with digital power 16, mainboard mould
Intend power supply 18, conductance with corresponding points on isolation analog power 34 to be connected；Mainboard with digital power 16 by power line respectively with
The circuit 17 of safety electric capacity one, in piece system power supply and reset circuit 19, CAN isolated drive circuit 21, switch output control
Circuit 22 processed, built-in function circuit 23, liquid crystal touch screen input/output communication interface circuit 24, display board communication interface circuit
25th, corresponding points are connected on conductance trip stop transmission circuit 28；Also pass through analog power in piece system power supply and reset circuit 19
Line and digital sub-power source line be not with first in piece circuit system 15, mainboard digital power 16, mainboard analog power 18, simulation
The corresponding points of signal limiter protection circuit 20 are connected, and the analog power and digital power of high-quality are provided for the system core；Conductance is used
Isolate analog power 34 by analog power line respectively with temperature detection interface 26, temperature pick-up isolation circuit 27, conductance measurement
With exchange turn direct current and isolation circuit 29, constant current signal drive circuit 31, precision voltage source circuit 33, on the circuit 35 of safety electric capacity two
Corresponding points are connected, first piece circuit system 15 by data communication line respectively with CAN isolated drive circuit 21, liquid crystal
Touch-screen input/output communication interface circuit 24, the corresponding points of display board communication interface circuit 25 are connected；First in piece system electricity
Road 15 is connected by analog signal line with analog signal limiter protection circuit 20, and first is believed in piece circuit system 15 by switching
Number line is connected with switch output control circuit 22, built-in function circuit 23, conductance trip stop transmission circuit 28, and first in piece system
Circuit 15 is also connected by reset line with piece system power supply and reset circuit 19；
Exiting signal generating circuit 32 of the present invention is connected by power line with the corresponding points of precision voltage source circuit 33；It is permanent
Signal drive circuit 31 is flowed to examine by signal wire and conductance trip stop transmission circuit 28, exiting signal generating circuit 32, conductance respectively
The corresponding points of interface 30 are surveyed to be connected；Conductance measurement turns direct current and isolation circuit 29 respectively by signal wire and analog signal with exchanging
Limiter protection circuit 20, the corresponding points of Conductivity detection interface 30 are connected；Temperature pick-up isolation circuit 27 respectively by signal wire with
Temperature detection interface 26, the corresponding points of analog signal limiter protection circuit 20 are connected；Temperature detection interface 26 passes through shielded cable
External semiconductor temperature sensor；Conductivity detection interface 30 passes through the external seven-electrode conductivity sensor of shielded cable.
Operation button of the present invention include current alerts button 4, the defeated button 5 of real-time curve, operation calibration frames button 6,
History curve button 7, history alarm button 8, help button 9, automatic/hand switching push button 11, manual on/off switch button
14；The display window includes CAN addresses display window 1, temperature display device 2, standard conductivity display window 3, switch pump and indicates display
Window 10, system alarm state display window to change 12, CAN communication state display window to change 13.
The present invention has the following advantages and effect relative to prior art：
(1) strong antijamming capability, AC power is connected to twin-stage wave filter, and direct-current switch power supply is connected to DC filter and big
Amount uses solid capacitor, and some places are also powered using second level analog power, so as to ensure the quality of direct current supply；System is led to
Cross safety electric capacity to be grounded, can effectively eliminate and disturb and ensure safety.
(2) measurement accuracy is high, using precision optical machinery relay, its contact resistance very little；Alternating constant exciting circuit can have
Effect ground eliminates the influence for the additional resistance that electrode surface dirt is produced；Signal input uses the instrument amplifier of high input impedance,
The influence of the additional resistance of dirt generation can be eliminated, common mode disturbances can be greatly eliminated again；Analog portion all employs high frequency
The resistance of low drifting precision amplifier and thousand-island forest park, so as to ensure that the precision of input pick-up.
(3) compatible good, function is more, communication is attached by using industrial standard liquid crystal touch screen, so that data
It has been shown that, input, alarm, curve record, inquiry etc. become easy；Fault-tolerant CAN communicates the use of isolation drive module, side
Just communicated with DCS or other systems with CAN and corresponding agreement.
(4) functional reliability is high, and using comprehensive Anti-Jamming Technique, using fault-toleranr technique, failure is only present in this module,
Other no failure parts do as usual work, when such as communication isolation drive module breaks down, and overall measurement part does as usual work, and surveys
Measure each road in electrode part independent, and added with protection circuit, the failure on a few roads does not interfere with other roads；With high alarm setting and report
The average value of alert lower limit carries out the control of ON/OFF amount and it is not transfinited, control effect is good as control definite value.
(5) easy to operate, internal control is completed by technical staff, and peripheral operation makees regular adjustment, operation by workman
Workman adjusts electrical conductivity alarm upper and lower limit according to process conditions, alarm signal and recording curve, in time and makees periodically clear to electrode
Wash.
(6) intelligence degree is high, and inner parameter has default value, by technical staff internally monitor in adjust, have
The position at multinomial warning function, the reason for being easy to help failure judgement and place.
(7) it can be attached between circuit board of the invention with simple connector or stub cable, it is manufacture, easy to maintenance, make
Valency is low, using aluminium cabinet, and complete machine radiating condition is good, and cabinet is hermetically sealed, can exempt dust, moisture intrusion, using industrial standard liquid
Brilliant touch-screen, and the configuration software being furnished with using the liquid crystal touch screen, it is possible to achieve powerful function, good appearance, operation side
Just；Anti- deadlock function, the system program is every to be had circulation and may cause the place of deadlock, internal counter, and over range is certainly
Dynamic to jump out, system design margin is larger, can in the range of 220V ± 30% normal work.
Brief description of the drawings
Fig. 1 is the contour structures schematic diagram for detecting monitor of the invention；
Fig. 2 is the motherboard circuits structural representation for detecting monitor of the invention；
Fig. 3 is the detection monitor of the present invention first in piece circuit system schematic diagram；
Fig. 4 for the present invention detection monitor motherboard circuits in piece system power supply and reset circuit schematic diagram；
Fig. 5 is the analog signal limiter protection circuit schematic diagram in the motherboard circuits of the detection monitor of the present invention；
Fig. 6 for the present invention detection monitor motherboard circuits in mainboard digital power, safety condenser network one,
Mainboard analog power schematic diagram；
Fig. 7 for the present invention detection monitor motherboard circuits in switch output control circuit, built-in function circuit,
Liquid crystal touch screen input/output communication interface circuit, the schematic diagram of display board communication interface circuit；
Fig. 8 for the present invention detection monitor motherboard circuits in CAN isolated drive circuit schematic diagram；
Fig. 9 is the temperature detection interface in the motherboard circuits of the detection alarm of the present invention, temperature pick-up isolation circuit
Schematic diagram；
Figure 10 turns direct current with exchange and isolates electricity for the conductance measurement in the motherboard circuits of the detection alarm of the present invention
Road, the schematic diagram of Conductivity detection interface；
Figure 11 is the conductance trip stop transmission circuit in the motherboard circuits of the detection alarm of the present invention, constant current signal driving
The schematic diagram of circuit, exiting signal generating circuit；
Figure 12 is the precision voltage source circuit in the motherboard circuits of the detection alarm of the present invention, conductance isolation simulation electricity
Source, the schematic diagram of the circuit of safety electric capacity two；
Figure 13 is the main program block diagram for detecting alarm of the invention；
Figure 14 is the monitoring subroutine block diagram for detecting alarm of the invention；
Figure 15 is the timer interrupt program block diagram for detecting alarm of the invention；
Figure 16 is received for the serial ports of the detection alarm of the present invention and is sent interrupt routine block diagram；
Figure 17 receives interrupt routine block diagram for the CAN of the detection alarm of the present invention.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, referring to
Accompanying drawing develops simultaneously, and the present invention is described in more detail for embodiment.It should be appreciated that specific embodiment described herein is only used to
The present invention is explained, is not intended to limit the present invention.
Embodiment
As shown in figure 1, the present invention uses a size for 265 × 250 × 365mm casing, standard is installed in casing
Industry control liquid crystal touch screen, motherboard, switch power module, connection cable, alternating current supply filter, power input socket, conductance
Electrode cable joint, temperature cable connector, switch accessory power outlet, CAN cable sockets, ground terminal, pass through short electricity between them
Cable is attached in respective point；It is also separately installed on motherboard to have shielding galvanized iron plate.
By computer self routing motherboard circuits, all-network label identical place computer is connected in one automatically
Rise, as shown in figure 3, in motherboard circuits of the present invention, first in piece circuit system 15 by integrated circuit U1, crystal oscillator U2, even
Device J1, resistance R1, electric capacity C1~C22 common electricals is connect to connect and compose；As shown in figure 4, in piece system power supply and reset circuit
19 by voltage-stablizer U3 and U4, connector J2, diode D1~D4 and D6~D7, light emitting diode D5 and D8, resistance R2~R5, electricity
Hold C23~C29, button S1 common electricals to connect and compose；As shown in figure 5, analog signal limiter protection circuit 20 is by amplifier U6
With U8, voltage stabilizing chip U5, limited amplitude protection chip U7, resistance RX1~RX9 and R6, electric capacity C30~C35 and CX1, light emitting diode
L1 common electricals are connected and composed；As shown in fig. 6, mainboard with digital power 16 by connector DC1 and outside connected switch power supply, wave filter
U9, electric capacity C36 and C37 common electrical connection composition；The circuit 17 of safety electric capacity one is by magnetic bead RL1, resistance R7, safety electric capacity C38
Common electrical connection composition；Mainboard is with analog power 18 by connector DC2 and outside connected switch power supply, wave filter U10 and U11, electricity
Hold C39~C42 common electricals connection composition；As shown in fig. 7, switch output control circuit 22 by relay U13, connector J5,
Triode N1, diode D9, resistance R15, electric capacity C44 common electricals connection composition, wherein J5 provide switch control output, dial-up
NBJ1 can forbid it to export；Built-in function circuit 23 is made up of toggle switch NBJ1 and NBJ2, the connection of exclusion R14 common electricals,
NBJ1 is monitoring dial-up, and NBJ2 is CAN geocodings；Liquid crystal touch screen input/output communication interface circuit 24 is by integrated circuit
U12, connector P1 and J4, resistance R10~R13, magnetic bead RL2, electric capacity C43 common electricals connection composition, wherein, P1 connection liquid crystal
Touch-screen；Display board communication interface circuit 25 is made up of connector J3, resistance R8~R9 common electricals connection, standby；Such as Fig. 8 institutes
Show, CAN isolated drive circuit 21 is by integrated circuit U14, connector CAN1, resistance R16~R17, electric capacity C45 common electricals
Connection composition, wherein, the external CANs of CAN1；As shown in figure 9, temperature detection interface 26 is made up of connector JT1, external half
Conductor temperature sensor；Temperature pick-up isolation circuit 27 is by amplifier U16, signal isolator U15, resistance R18~R20, electric capacity
C46~C55 common electricals are connected and composed；As shown in Figure 10, conductance measurement turns direct current and isolation circuit 29 by amplifier with exchanging
U17 and U20~U21 and U24, AC DC signal adapter U19 and U22, signal isolator U18 and U23, resistance R21~
R25, electric capacity C56~C75 common electricals are connected and composed；Conductivity detection interface 30 is made up of connector JD1, external seven electrode conductance
Rate sensor；As shown in figure 11, conductance trip stop transmission circuit 28 is by relay U25~U29, triode N2~N6, diode D10
~D14, resistance R26~R31 common electricals are connected and composed；Constant current signal drive circuit 31 is by amplifier U31~U33, resistance
RX10~RX14 and RA1~RA13, electric capacity C76~C79 and C83~C89 common electricals are connected and composed；Exiting signal generating circuit
32 are connected and composed by integrated circuit U30, resistance RIN1 and R32, electric capacity C80~C81 and C82 and CF1 common electricals；Such as Figure 12 institutes
Show, precision voltage source circuit 33 is by voltage-stablizer U36~U37, inductance L2~L5, electric capacity C94~C97 and C99~C100 common electricals
Connect and compose；Conductance is with isolation analog power 34 by connector DC3 and outside connected switch power supply, wave filter U34~U35, electric capacity C90
~C93 common electricals are connected and composed；The circuit 35 of safety electric capacity two is connected by resistance R33, magnetic bead RL3, safety electric capacity C98 common electricals
Connect composition；
Wherein, the optional C8051F060 of U1, U3, U4, U5 optional AMS1117, the U6 optional TLV2454 of optional TLE2024, U8,
U7 optional TL7726, U9~U11 and U34~U35 optional TY110P, U12 optional MAX490CSA, U13 are optional with U25~U29
The optional CTM1054 of CTX-5V, U14；The optional ISO124 of U16, U21 optional INA128, U15；The optional INA111 of U17, U20, U24 or
The optional T6650D of INA121, U19, U22 optional AD536, U18, U23；U30 optional MAX038, U31 optional LM7171, U32 are optional
LM6172, U33 optional OPA627, U36, U37 optional K7805, the optional SUKON-07L of liquid crystal touch screen.
The operation principle of the present invention is as follows：
(1) temperature-voltage signal subsidiary semiconductor temperature sensor on electrode is produced, the millivolt signal first amplifies, every
Connect from after through cable connector on motherboard；
(2) the generation process of conductance millivolt signal is as follows：The controlled certain frequency that produces of exiting signal generating circuit first is consolidated
The sinusoidal signal of tentering degree, the signal connects constant current signal drive circuit 31, and range switching control is made through conductance trip stop transmission circuit 28
After system, certain driving constant current is produced, this constant current is used to drive conductance electrode after handling through blocking, and the constant current flows through standard simultaneously
Resistance and detection cell and the AC signal for producing respective amplitude, the voltage of the bigger generation of cell resistance are bigger, then this two
Road AC signal respectively enters ac/dc effective value converter and produces corresponding DC voltage, two-way DC voltage warp
After amplification, isolation processing, then through analog signal limiter protection circuit feeding main frame；
(3) temperature signal produced respectively by said process enters 12 A/D converters, and conductance signal enters two-way 16
The A/D converter port of position precision, can obtain the resistance at measuring cell two ends, the resistance is linear by the simple operation of single-chip microcomputer
After correcting process, accurate resistance value is obtained, the inverse of accurate resistance value is exactly to hold electric conductivity value, then through electrode conductance constant and temperature
Standard conductivity value is obtained after degree compensation；
(4) each signal after processing is sent to liquid after the encoded packing of piece system by first in the way of communicating interrupt
Brilliant touch-screen carries out the display of corresponding data, i.e., refresh CAN addresses display window 1, temperature display device 2, standard conductivity in real time and show
Show that window 3, switch pump indicate display window 10, system alarm state display window to change 12, CAN communication state display window to change 13；
(5) current alerts button 4 on liquid crystal touch screen, real-time curve button 5, operation calibration frames button 6, history are bent
Line button 7, history alarm button 8, help button 9, automatic/hand switching push button 11, manual on/off switch button 14 are encoded
First also is sent in piece system in the way of communicating interrupt afterwards, and performs corresponding operation；
(6) All hosts program and preset parameter are all stored in first in the piece of piece system in EEPROM, computing variable
It is temporarily stored in the first RAM in piece system；
(7) first carry out the communication between corresponding interface and agreement through CAN isolated drive circuit in piece system, the above,
Intermediate value between lower limit produces the switch output of pump as control definite value, then after being handled through Positive-Negative Action, can be through switch output control
Circuit processed provides normally opened, normally-closed contact and completed；When electrical conductivity exceedes upper and lower limit, it generate and alert indicate that；
(8) when system needs adjustment internal control parameter, pressing operation calibration picture, the picture is configured with multiple displays
Window, is conductance millivolt indicating window respectively, with reference to millivolt indicating window, end resistance value indicating window, standard conductivity indicating window, end conductance
It is worth indicating window, conductance range indicating window, range automatic/hand indicating window；The touch-screen is limited equipped with input keyboard and to data
Width processing, data input realizes that they are respectively by pressing the keyboard respectively, electrode constant button, temperature compensation coefficient button,
Temperature slope button, zero temperature point button, the button of resistance slope 12, the button of resistance 0. 12, the calibration of range 3/4 picture, conductance
Rate zero-setting button, high alarm setting button, low alarm setting button, lag time button, Positive-Negative Action button, return key frame are pressed
Button, HMI data are sent to enter single-chip microcomputer button；The data of all inputs are equipped with power down protection processing, note only by force feed HMI numbers
Data could be sent into single-chip microcomputer according to single-chip microcomputer button is entered；In order to ensure the precision of measurement, range one is provided with public with two gears
Resistance slope amendment and resistance zero point amendment；Specially treated has been made to range 3/4, wherein, the power taking of range 3 resistance 500,600,
700th, 800,900,1000,2000,3000,4000, the magnitude of voltage at 5000 ohm is used as the foundation for interpolation of linearly tabling look-up, range
4 processing procedure is similar, its resistance value be 5000,6000,7000,8000,9000,10000,20000,30000,40000,
50000 ohm.
The technical indicator and parameter of embodiments of the invention are as follows：(1) input voltage：AC220V ± 30%, 50Hz；(2)
Mean power：20W；(3) electrical conductivity detection range：20 μ S~200mS；(4) fluid temperature：0~99.9 DEG C；(5) switch control
Mode：Automatic or manual；(6) electrical conductivity on-line checking point precision：≤ 1% (in a wide range of)；(7) when the detection of trip stop maximum is delayed
Between：≤ 2 seconds.
In the use of the present invention, first connecing alternating current 220V voltage, external connection Switching Power Supply, conductance electrode (has semiconductor
Temperature sensor), dosing pump, specific works step during detection is：(1) power-on；(2) memory internal parameter is adjusted；Afterwards
Operator can adjust electrical conductivity bound in time according to process conditions, alarm signal and recording curve on liquid crystal touch screen
Alarming value, and calibration of periodically being cleaned and returned to zero to conductance electrode.
Mainframe program is shown in Figure 13, and measurement monitoring processing routine is shown in Figure 14, when using for the first time：Toggle switch NBJ2 conducts are set
CAN addresses, notice that CAN addresses 0 are defaulted as host address, other CAN terminal address are not reproducible；Toggle switch NBJ1 is set to arrive
Implicit parameter, start, to allow first original canonical parameter is sent in RAM in piece system；Then code is reversed to memory parameter bit,
Complete normal boot-strap；Afterwards, the operation calibration frames button on pressing liquid crystal touch screen, and by built-in keybad input parameter,
They are：Electrode constant button, temperature compensation coefficient button, temperature slope button, zero temperature point button, the button of resistance slope 12, electricity
Hinder 0. 12 buttons, range 3/4 calibration picture, electrical conductivity zero-setting button, high alarm setting button, low alarm setting button, it is delayed when
Between button, Positive-Negative Action button, return to key frame button, send HMI data to enter after the completion of single-chip microcomputer button, parameter setting, note
Force feed HMI data must be pressed and enter single-chip microcomputer button, so, single-chip microcomputer could receive corresponding data, and the data are saved in
In internal EEPROM, in case during start next time, the memory parameter is called in automatically.Meanwhile, monolithic is also periodically flushed in LCDs
The data that machine is sent, they are：Conductance millivolt indicating window, refer to reference to millivolt indicating window, end resistance value indicating window, standard conductivity
Show window, end electric conductivity value indicating window, conductance range indicating window, range auto-manual indicating window；Utilize the work(built in liquid crystal touch screen
Real-time curve, history curve can be drawn, and can show that Realtime Alerts are alarmed with history.Internal system is made in timing with 25 milliseconds
It is disconnected, see Figure 15, corresponding software time timer is managed as internal control；See Figure 16, the serial data with liquid crystal touch screen
Interrupt mode is also taken in exchange, sends and reception is all respectively arranged with buffer circle, monitoring programme only need to be to the loop buffer
Area is handled just；See Figure 17, CAN once receives the time synchronizing signal that main frame is sent, and communication time is reset at once,
Then, by CAN address code sizes, within the corresponding period, corresponding information is sent；Temperature channel can be made by slope and zero point
Linear amendment；Conductance range 1/2 need to only make linear amendment to resistance slope 12 and resistance 0. 12, and conductance range 3/4 will
Into another picture, and the magnitude of voltage under each measuring resistance is recorded, the makeover process needs to use a. c. resistance box；Electrode constant
Adjustment need standard K CL buffer solutions, temperature value adjustment needs thermometer；This is arrived, complete machine adjustment is finished；Peripheral operation is by workman
Make adjustment regularly, appropriate.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (9)
1. a kind of single channel seven-electrode conductivity detects monitor, including data display and input actuation means and motherboard group
Into, it is characterised in that
The data display is realized with input actuation means by LCD panel, including display window and operation button, for completing
The informational function of the monitor show and control information input operation；
The motherboard includes first in piece circuit system, mainboard digital power, the circuit of safety electric capacity one, mainboard simulation electricity
Source, in piece system power supply and reset circuit, analog signal limiter protection circuit, CAN isolated drive circuit, switch output
Control circuit, built-in function circuit, liquid crystal touch screen input/output communication interface circuit, display board communication interface circuit, temperature
Detection interface, temperature pick-up isolation circuit, conductance trip stop transmission circuit, conductance measurement turn direct current and isolation circuit, electricity with exchanging
Lead detection interface, constant current signal drive circuit, exiting signal generating circuit, precision voltage source circuit, conductance isolate analog power,
The circuit of safety electric capacity two；
The mainboard digital power is by power line respectively with the circuit of safety electric capacity one, in piece system power supply and reset electricity
Road, CAN isolated drive circuit, switch output control circuit, built-in function circuit, liquid crystal touch screen input/output communication
Interface circuit, display board communication interface circuit, corresponding points are connected on conductance trip stop transmission circuit；It is described in piece system power supply
And reset circuit also by analog power line and digital sub-power source line not with first piece circuit system, mainboard digital power,
Mainboard is connected with the corresponding points of analog power, analog signal limiter protection circuit, and the core component for above-mentioned motherboard is provided
Analog power and digital power；The conductance with isolation analog power by analog power line respectively with temperature detection interface, temperature
Degree pick-up isolation circuit, conductance measurement with exchange turn direct current and isolation circuit, constant current signal drive circuit, precision voltage source circuit,
The corresponding points of the circuit of safety electric capacity two are connected；Described first piece circuit system by data communication line respectively with CAN
Isolated drive circuit, liquid crystal touch screen input/output communication interface circuit, the corresponding points of display board communication interface circuit are connected
Connect；Described first is connected in piece circuit system by analog signal line with analog signal limiter protection circuit, described first
Piece circuit system is connected by switch signal line with switch output control circuit, built-in function circuit, conductance trip stop transmission circuit
Connect, described first is also connected by reset line in piece circuit system with piece system with power supply and reset circuit；The excitation
Signal generating circuit is connected by power line with the corresponding points of precision voltage source circuit；The constant current signal drive circuit leads to respectively
The corresponding points that signal wire is crossed with conductance trip stop transmission circuit, exiting signal generating circuit, Conductivity detection interface are connected；The electricity
Lead measurement and turn direct current and isolation circuit respectively by signal wire and analog signal limiter protection circuit, Conductivity detection interface with exchanging
Corresponding points be connected；The temperature pick-up isolation circuit passes through signal wire and temperature detection interface, analog signal amplitude limit respectively
The corresponding points of protection circuit are connected；
The LCD panel is led to equipped with interface and by the liquid crystal touch screen input/output on stub cable and the motherboard
Communication interface circuit is connected.
2. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the liquid crystal touch screen
Powered by external DC24V, mainboard digital power, mainboard analog power, the conductance isolation analog power of the motherboard
Upper corresponding points distinguish external 3 Switching Power Supplies by power line.
3. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the temperature detection connects
Mouth is by the external semiconductor temperature sensor of shielded cable, and the Conductivity detection interface passes through external seven electrode conductance of shielded cable
Rate sensor or four electrode conductivity sensors.
4. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that described first in piece system
System circuit includes integrated circuit U1, crystal oscillator U2, connector J1, resistance R1, electric capacity C1~C22 common electricals and connected and composed；It is described
Include voltage-stablizer U3 and U4, connector J2, diode D1~D4 and D6~D7, luminous two in piece system power supply and reset circuit
Pole pipe D5 and D8, resistance R2~R5, electric capacity C23~C29, button S1 common electricals are connected and composed；The analog signal amplitude limit is protected
Protection circuit includes amplifier U6 and U8, voltage-stablizer U5, limited amplitude protection chip U7, resistance RX1~RX9 and R6, electric capacity C30~C35
And CX1, light emitting diode L1 common electricals are connected and composed；The mainboard includes connector DC1 and outside connected switch with digital power
Power supply, wave filter U9, electric capacity C36 and C37 common electrical connection composition；The circuit of safety electric capacity one includes magnetic bead RL1, resistance
R7, safety electric capacity C38 common electricals connection composition；Mainboard analog power include connector DC2 and outside connected switch power supply,
Wave filter U10 and U11, electric capacity C39~C42 common electricals connection composition；The switch output control circuit includes relay
U13, connector J5, triode N1, diode D9, resistance R15, electric capacity C44 common electricals connection composition, wherein J5 provide switch
Control output, dial-up NBJ1 can forbid J5 to export；The built-in function circuit includes toggle switch NBJ1 and NBJ2, exclusion R14
Common electrical connection composition, wherein NBJ1 is monitoring dial-up, and NBJ2 is CAN geocodings；The liquid crystal touch screen input/output
Communication interface circuit includes integrated circuit U12, connector P1 and J4, resistance R10~R13, magnetic bead RL2, electric capacity C43 common electricals
Connection composition, wherein, the P1 connections liquid crystal touch screen；The display board communication interface circuit includes connector J3, resistance R8
~R9 common electricals connection composition；The CAN isolated drive circuit includes integrated circuit U14, connector CAN1, resistance
R16~R17, electric capacity C45 common electricals connection composition, wherein, the external CANs of CAN1；The temperature detection interface is by connecting
Device JT1 is constituted, for external semiconductor temperature sensor；The temperature pick-up isolation circuit includes amplifier U16, signal isolation
Device U15, resistance R18~R20, electric capacity C46~C55 common electricals are connected and composed；The conductance measurement with exchange turn direct current and every
From circuit include amplifier U17 and U20~U21 and U24, AC DC signal adapter U19 and U22, signal isolator U18 and
U23, resistance R21~R25, electric capacity C56~C75 common electricals are connected and composed；The Conductivity detection interface includes connector JD1 groups
Into external seven-electrode conductivity sensor；The conductance trip stop transmission circuit include relay U25~U29, triode N2~
N6, diode D10~D14, resistance R26~R31 common electricals are connected and composed；The constant current signal drive circuit includes amplifier
U31~U33, resistance RX10~RX14 and RA1~RA13, electric capacity C76~C79 and C83~C89 common electricals are connected and composed；Institute
State exiting signal generating circuit jointly electric including integrated circuit U30, resistance RIN1 and R32, electric capacity C80~C81 and C82 and CF1
Gas is connected and composed；The precision voltage source circuit include voltage-stablizer U36~U37, inductance L2~L5, electric capacity C94~C97 and C99~
C100 common electricals are connected and composed；The conductance includes connector DC3 and outside connected switch power supply, wave filter with isolation analog power
U34~U35, electric capacity C90~C93 common electricals are connected and composed；The circuit of safety electric capacity two include resistance R33, magnetic bead RL3,
Safety electric capacity C98 common electricals are connected and composed.
5. single channel seven-electrode conductivity according to claim 4 detects monitor, it is characterised in that the integrated circuit U1
For chip C8051F060, described voltage-stablizer U3, U4, U5 are AMS1117, and the amplifier U6 is TLE2024, the amplifier
U8 is TLV2454, and the limited amplitude protection chip U7 is that chip TL7726, the wave filter U9~U11 and U34~U35 are
TY110P, the integrated circuit U12 are that chip MAX490CSA, the relay U13 and U25~U29 are CTX-5V, the collection
It is chip CTM1054 into circuit U 14, described amplifier U16, U21 are INA128, and the signal isolator U15 is ISO124；Institute
Amplifier U17, U20, U24 are stated for INA111 or INA121, described AC DC signal adapter U19, U22 are AD536, described
Signal isolator U18, U23 are T6650D, and the integrated circuit U30 is MAX038, and the amplifier U31 is chip LM7171,
The amplifier U32 is chip LM6172, and the amplifier U33 is chip OPA627, and described voltage-stablizer U36, U37 are K7805,
The liquid crystal touch screen is SUKON-07L.
6. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the operation button bag
Include the defeated button of current alerts button, real-time curve, operation calibration frames button, history curve button, history alarm button, help press
Button, automatic/hand switching push button, manual on/off switch button.
7. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the display window includes
CAN addresses display window, temperature display device, standard conductivity display window, switch pump indicate display window, system alarm status display
Window, CAN communication state display window to change.
8. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the monitor is used
Divide gear accurate exchange constant current drive, and driving frequency is adjustable, it is possessed anti-electrode incrustation ability；The monitor is using high
Resistance instrument amplifier is acquired to signal.
9. single channel seven-electrode conductivity according to claim 1 detects monitor, it is characterised in that the amount of the monitor
Journey is provided with four gears, and the electrical conductivity to 20uS/cm~200mS/cm scopes carries out direct measurement, coordinates the electrode of various conductance constants
Range ability can be extended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510451495.4A CN104977322B (en) | 2015-07-28 | 2015-07-28 | A kind of single channel seven-electrode conductivity detects monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510451495.4A CN104977322B (en) | 2015-07-28 | 2015-07-28 | A kind of single channel seven-electrode conductivity detects monitor |
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| Publication Number | Publication Date |
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| CN104977322A CN104977322A (en) | 2015-10-14 |
| CN104977322B true CN104977322B (en) | 2017-10-20 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6907322B2 (en) * | 2000-11-30 | 2005-06-14 | International Business Machines Corporation | Method and apparatus for characterization of thermal response of GMR sensors in magnetic heads for disk drives |
| CN2580438Y (en) * | 2002-04-29 | 2003-10-15 | 长春工业大学 | Electrical conductivity measurer |
| CN2622703Y (en) * | 2003-06-06 | 2004-06-30 | 上海嘉定诚磁仪电设备厂 | Intelligence conductive resistivity monitor |
| CN202133719U (en) * | 2011-06-24 | 2012-02-01 | 华南理工大学 | Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function |
| CN102353844B (en) * | 2011-06-24 | 2014-02-12 | 华南理工大学 | Detecting and monitoring method of two-way electrical conductivity detecting and monitoring device with symmetrical lead self-compensation |
| CN204832094U (en) * | 2015-07-28 | 2015-12-02 | 华南理工大学 | Seven electrode conductance rates of one way detect control appearance |
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